Mill Street over Souhegan River
FairHillsborough County, New Hampshire · 0.17 MI W JCT Nh 31 · Structure no. 010400730010400
- Built
- 1925
- 100 years old
- Condition
- Fair
- inspected May 2024
- Type
- Arch - Deck
- Masonry
- Length
- 43 ft
- 1 main span
- Daily traffic
- 1,043
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Mill Street over Souhegan River is a masonry arch - deck carrying Mill Street over Souhegan River in Hillsborough County, New Hampshire. It was built in 1925, so it is 100 years old, older than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,043 vehicles a day, roughly 4% of them trucks, projected to reach 1,543 by 2043. The structure is 43 ft (13.1 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mill Street over Souhegan River built?
It was built in 1925, making it 100 years old in 2025.
What condition is Mill Street over Souhegan River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.
How much traffic does Mill Street over Souhegan River carry?
About 1,043 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Mill Street over Souhegan River?
The structure is 43 ft (13.1 m) long with a longest span of 35 ft (10.7 m) and a deck 30 ft wide.
Who owns Mill Street over Souhegan River?
It is owned by the State Highway Agency.